UE C++ 设置碰撞前 后事件 碰撞中事件

一.在Actor中声明碰撞BOX组件

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MySceneComponent")
		class UBoxComponent* MyBox;

在Actor以这样的形式实现代理绑定，在BeginPlay()里。

MyBox->OnComponentBeginOverlap.AddDynamic();

转到OnComponentBeginOverlap定义

再转到这个代理的定义

/** Delegate for notification of start of overlap with a specific component */
DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE_SixParams( FComponentBeginOverlapSignature, UPrimitiveComponent, OnComponentBeginOverlap, UPrimitiveComponent*, OverlappedComponent, AActor*, OtherActor, UPrimitiveComponent*, OtherComp, int32, OtherBodyIndex, bool, bFromSweep, const FHitResult &, SweepResult);

这里是6个参数，从后向前数六个参数。将中间的“，”去掉，作为调用函数的参数。其余两个绑定也是类似的思路。

	UFUNCTION()
	void BeginOverlapFunction(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);
	UFUNCTION()
	void EndOverlapFunction( UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex); //四个参数
	// FComponentEndOverlapSignature, UPrimitiveComponent, OnComponentEndOverlap, UPrimitiveComponent*, OverlappedComponent, AActor*, OtherActor, UPrimitiveComponent*, OtherComp, int32, OtherBodyIndex
	UFUNCTION()
	void HitOverlaoFunction(UPrimitiveComponent* HitComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit);
	//UPrimitiveComponent*, HitComponent, AActor*, OtherActor, UPrimitiveComponent*, OtherComp, FVector, NormalImpulse, const FHitResult&, Hit

声明后在cpp中实现

void AMyActor::BeginOverlapFunction(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
	GEngine->AddOnScreenDebugMessage(-1,5.0f,FColor::Red,TEXT("BeginOverLapEvent is Success"));
}

void AMyActor::EndOverlapFunction( UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex)
{
	GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Red, TEXT("EndOverlapEvent is Success"));
}

void AMyActor::HitOverlaoFunction(UPrimitiveComponent* HitComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit)
{
	GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Red, TEXT("HitOverlapEvent is Success"));
}

回调的函数完成

最上面的代理绑定完整版如下：

	MyBox->OnComponentBeginOverlap.AddDynamic(this,&AMyActor::BeginOverlapFunction);
	MyBox->OnComponentEndOverlap.AddDynamic(this,&AMyActor::EndOverlapFunction);
	MyBox->OnComponentHit.AddDynamic(this,&AMyActor::HitOverlaoFunction);

一般这里有报错，有可能就是代理调用函数的参数个数弄错了。

这里测试碰撞前 碰撞后的代理函数

设置碰撞，就可以一直调用 碰撞中的代理函数